CN113405377A

CN113405377A - Combined heat exchanger of marine diesel engine

Info

Publication number: CN113405377A
Application number: CN202110522952.XA
Authority: CN
Inventors: 何小莉
Original assignee: Individual
Current assignee: Zhanjiang Yueshui Fishery Co ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2021-09-17
Anticipated expiration: 2041-05-13
Also published as: CN116222263A; CN113405377B

Abstract

The invention discloses a combined heat exchanger of a marine diesel engine, which comprises a heat exchange shell and is characterized in that: the heat exchange shell comprises a heat exchange shell and is characterized in that two supporting seats are welded at the bottom end of the heat exchange shell, a water inlet and a water outlet are welded at the upper side and the lower side of the left end of the heat exchange shell respectively, one ends of the water inlet and the water outlet are connected with a pump through pipelines, an air inlet pipe and an air outlet pipe are welded at the right side, located at the water inlet and the water outlet, of the left section of the heat exchange shell respectively, a partition plate is welded at the left end inside the heat exchange shell, a fixing plate is welded inside the heat exchange shell, a first heat exchange pipe and a second heat exchange pipe are arranged inside the heat exchange shell, the first heat exchange pipe and the second heat exchange pipe are U-shaped, the two ends of the first heat exchange pipe and the second heat exchange pipe are both slidably connected with the fixing plate, and a plurality of air baffles are welded on the inner wall of the heat exchange shell and the upper end face and the lower end face of the partition plate.

Description

Combined heat exchanger of marine diesel engine

Technical Field

The invention relates to the technical field of heat exchange, in particular to a combined heat exchanger of a marine diesel engine.

Background

The mixed heat exchanger transfers heat by direct contact of cold and hot fluids, the heat transfer mode reduces the heat transfer partition wall and dirt heat resistance at two sides of the heat transfer partition wall, and as long as the contact condition between the fluids is good, the mixed heat exchanger has a larger heat transfer rate, so that the mixed heat exchanger can be adopted in the occasions where the fluids are allowed to be mixed with each other.

The prior combined heat exchanger has unadjustable heat exchange efficiency and poor practicability; meanwhile, after the existing combined heat exchanger is used for a long time, more scale can be generated in the heat exchange tube, and the heat exchange tube is difficult to clean. Therefore, it is necessary to design a combined heat exchanger of a marine diesel engine which ensures heat exchange efficiency and reduces scale generation to facilitate cleaning of heat exchange pipes.

Disclosure of Invention

The invention aims to provide a combined heat exchanger of a marine diesel engine, which solves the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme: the combined heat exchanger of the marine diesel engine comprises a heat exchange shell and is characterized in that: the bottom welding of heat transfer shell has two supporting seats, water inlet and delivery port have been welded respectively to the downside on the left end of heat transfer shell, the one end of water inlet and delivery port all has the pump machine through the pipe connection, intake pipe and outlet duct have been welded respectively on the right side that the left section of heat transfer shell is located water inlet and delivery port.

According to the technical scheme, the welding of the inside left end of heat transfer shell has the baffle, the inside welding of heat transfer shell has the fixed plate, the inside of heat transfer shell is provided with heat exchange tube one and heat exchange tube two, heat exchange tube one and heat exchange tube two are the U type, the both ends of heat exchange tube one and heat exchange tube two all with fixed plate sliding connection, it has a plurality of gas baffles, per two all to weld on the inner wall of heat transfer shell and the upper and lower both ends face of baffle all be provided with two standby plates between the gas baffle, heat exchange tube one and heat exchange tube two run through gas baffle and gas baffle sliding connection.

According to the technical scheme, the right end of the water inlet is connected with a suction machine through a pipeline, a plurality of water tanks are fixed inside the heat exchange shell, one end of the suction machine is connected to the top end of the water tank closest to the water inlet through a pipeline, a connecting pipe is sleeved between every two water tanks, the right end of each water tank is connected with a standby plate through a pipeline, and the standby plate is in a multi-section sleeved mode.

According to the technical scheme, two connecting plates are welded on the inner side of the water inlet, one sides of the two connecting plates opposite to each other are connected with a water contact plate through bearings, one side of the connecting plate close to the water contact plate is fixed with a first air bag, hydrogen is arranged in the first air bag, one end of each of the two first air bags is sleeved with a manifold, the right end of the manifold pipe is sleeved with a gas distribution pipe, the right end of the gas distribution pipe is sleeved with a plurality of short pipes, the bottom ends of the inner parts of the plurality of water tanks are welded with conical ports, the inner side of the conical opening is provided with a second air bag, the short pipe is connected with the second air bag through a pipeline, the gas distribution pipe is divided into a plurality of sections, one section is arranged between every two water tanks, each section of the gas distribution pipe and the inside of the connecting pipe are connected with a rotating shaft through bearings, the rotating shaft is fixedly provided with circular magnetic blocks, and the diameters of the two circular magnetic blocks are respectively the same as the inner diameters of the gas distribution pipe and the connecting pipe.

According to the technical scheme, the left end of heat transfer shell is provided with the arc pipeline, the one end and the delivery port of arc pipeline cup joint, the other end of arc pipeline cup joints with the below that the left end of heat transfer shell is located the baffle, the inboard welding of delivery port has block net one, a plurality of filtration pores have been seted up on the left side below of check valve one on lieing in the arc pipeline, the below welding that lies in a plurality of filtration pores on the left end of heat transfer shell has trapezoidal return water mouth, one sliding connection has the scale removal ball in the heat exchange tube, trapezoidal return water mouth and arc pipeline all are provided with check valve one with the delivery port junction.

According to the technical scheme, the port that the arc-shaped pipeline and the left end of the heat exchange shell are located below the partition plate and are sleeved with each other penetrates through the heat exchange shell, the inside of the heat exchange shell is located below the partition plate and is provided with the meshed plate, a plurality of meshes are formed in the meshed plate, the meshed plate is divided into the upper portion, the middle portion and the lower portion, the right end of the meshed plate is welded to the upper side and the lower side, located at one end of the first heat exchange pipe and one end of the second heat exchange pipe, of the fixed plate, the middle portion of the meshed plate is welded to the fixed plate and located between the first heat exchange pipe and the second heat exchange pipe, and the left end of the meshed plate is connected with one end of the arc-shaped pipeline.

According to the technical scheme, the left end of the three-part reticular lamina and the arc pipeline joint are provided with the separation plate, an irregular sliding groove is formed in the separation plate, a central bearing of the irregular sliding groove is connected with the triangular block, two sliding ways are formed in two sides of the bottom end of the separation plate, two check valves II are arranged in the sliding ways, and the two sliding ways are respectively connected with gaps between the three-part reticular lamina.

According to the technical scheme, the internal weld of arc pipeline has the guide board, the left side welding of arc pipeline has the guiding tube, one side that arc pipeline is close to the guiding tube is fixed with the reserve tank, the central bearing of reserve tank is connected with the carousel, three recess has evenly been seted up on the carousel, wherein two sliding connection has reserve ball in the recess, breach one, breach two have been seted up respectively to the top and the right-hand member of reserve tank, breach one, breach two, the size of recess is the same, and the diameter of scaling ball is greater than the recess.

According to the technical scheme, the descaling balls are made of rubber.

According to the technical scheme, the heat exchange shell is divided into the left part and the right part, the left part and the right part are in threaded engagement, the first heat exchange tube and the second heat exchange tube are equally divided into three parts, and the first heat exchange tube and the second heat exchange tube are in threaded engagement.

Compared with the prior art, the invention has the following beneficial effects: the invention realizes that when the flow rate of cold water led into the heat exchange shell is changed, the led-in hot steam quantity is unchanged, the spare plates are extended out, the retention time of the hot steam in the heat exchange shell is prolonged, and the heat exchange efficiency is ensured by arranging the components such as the descaling balls, the arc-shaped pipelines, the reticular plates and the like, the descaling balls are continuously contacted with the inner wall of the heat exchange tube in the heat exchange process to remove water scale, and one descaling ball is utilized to clean a plurality of heat exchange tubes by utilizing the separating plate and the internal components thereof.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic sectional elevational view of a heat exchange shell in accordance with the present invention;

FIG. 2 is a schematic structural view in elevation and section of the heat exchange shell of the present invention;

FIG. 3 is a schematic view of the connection of the working principle of the water inlet and a plurality of standby plates of the present invention;

FIG. 4 is a perspective view of the inner part of the gas distributing pipe and the connecting pipe of the present invention;

FIG. 5 is a schematic sectional front view of the connection between the arc-shaped pipe and the heat exchange shell;

FIG. 6 is a schematic view of the connection of the separator plate to the mesh plate of the present invention;

FIG. 7 is a front cross-sectional structural schematic view of the inner components of the arcuate duct of the present invention;

in the figure: 1. a heat exchange shell; 2. a first heat exchange tube; 3. a second heat exchange tube; 4. a fixing plate; 5. a gas baffle; 6. a partition plate; 7. a water inlet; 71. a connecting plate; 72. a water contact plate; 73. a first air bag; 74. a manifold; 76. a gas distributing pipe; 77. a water tank; 78. a second air bag; 79. a connecting pipe; 8. a water outlet; 11. an arc-shaped pipeline; 111. a guide plate; 112. a guide tube; 113. a spare box; 114. a turntable; 115. a spare ball; 12. a trapezoidal water return port; 13. a first blocking net; 14. a separation plate; 141. a triangular block; 15. a mesh plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides the following technical solutions: the combined heat exchanger of the marine diesel engine comprises a heat exchange shell 1 and is characterized in that: the bottom end of the heat exchange shell 1 is welded with two supporting seats, the upper side and the lower side of the left end of the heat exchange shell 1 are respectively welded with a water inlet 7 and a water outlet 8, one ends of the water inlet 7 and the water outlet 8 are both connected with a pump through pipelines, and the left section of the heat exchange shell 1, which is positioned at the right sides of the water inlet 7 and the water outlet 8, is respectively welded with an air inlet pipe and an air outlet pipe; it can be known from figure 1 that place the device on the ship to the supporting seat is fixed, starts two pump machines, and is leading-in with cold water from the water inlet, and leading-in simultaneously is followed the admission pipe with hot steam, and hot steam exchanges heat with cold water inside the heat transfer shell, and final hot water is derived from the delivery port, and the steam that the heat transfer was accomplished is derived from the gas outlet.

A partition plate 6 is welded at the left end inside the heat exchange shell 1, a fixing plate 4 is welded inside the heat exchange shell 1, a first heat exchange tube 2 and a second heat exchange tube 3 are arranged inside the heat exchange shell 1, the first heat exchange tube 2 and the second heat exchange tube 3 are U-shaped, two ends of the first heat exchange tube 2 and the second heat exchange tube 3 are both in sliding connection with the fixing plate 4, a plurality of air baffles 5 are welded on the inner wall of the heat exchange shell 1 and the upper and lower end faces of the partition plate 6, two standby plates are arranged between every two air baffles 5, and the first heat exchange tube 2 and the second heat exchange tube 3 penetrate through the air baffles 5 and are in sliding connection with the air baffles 5; as shown in figure 1, cold water is led in from a water inlet, due to the blocking of the partition plate, the cold water enters the first heat exchange tube and the second heat exchange tube to circulate, hot steam is led in from a gas inlet, as can be seen from figure 1, the parts of the plurality of gas baffles are distributed one above the other in the heat exchange shell, namely, the first gas baffle is fixed with the top end of the inner wall of the heat exchange shell, the second gas baffle is fixed with the partition plate, and so on, the curve in figure 1 is a flow path of the steam, the straight line is a cold water flow path, the cold water flow path and the cold water flow path are relatively circulated, so that the hot steam is fully contacted with the cold water to exchange heat, and meanwhile, the gas baffles which are distributed up and down are utilized, so that the flowing and staying time of the hot steam in the heat exchange shell is prolonged, so as to improve the heat.

The right end of the water inlet 7 is connected with a suction machine through a pipeline, a plurality of water tanks 77 are fixed inside the heat exchange shell 1, one end of the suction machine is connected to the top end of the water tank 77 closest to the water inlet 7 through a pipeline, a connecting pipe 79 is sleeved between every two water tanks 77, the right end of each water tank 77 is connected with a standby plate through a pipeline, and the standby plate is in a multi-section sleeved type; when cold water is led into the heat exchange shell through the water inlet, the suction machine is started to pump out a part of cold water, the cold water is led into the water tank closest to the water inlet through the pipeline, the water is flushed in the water tank and then led into the standby plate through the pipeline, the standby plate is in a multi-section sleeved mode, and after the standby plate is flushed, the standby plate is extended, as shown by a dotted line part in the heat exchange shell in figure 3, when the cold water is led into the heat exchange tube to exchange heat, the cold water stretches out of the standby plate, so that the stay time of the hot steam in the heat exchange shell is prolonged, the heat in the hot steam is completely transferred to the cold water in the heat conduction tube to exchange heat, and the heat exchange efficiency is improved.

Two connecting plates 71 are welded on the inner side of the water inlet 7, one opposite sides of the two connecting plates 71 are respectively in bearing connection with a water contact plate 72, one side, close to the water contact plate 72, of each connecting plate 71 is fixedly provided with a first air bag 73, hydrogen is arranged inside the first air bag 73, one ends of the two first air bags 73 are respectively sleeved with a collecting pipe 74, the right end of the collecting pipe 74 is sleeved with a gas distribution pipe 76, the right end of the gas distribution pipe 76 is sleeved with a plurality of short pipes, the bottom ends inside the water tanks 77 are respectively welded with a conical opening, the inner sides of the conical openings are provided with second air bags 78, the short pipes are connected with the second air bags 78 through pipelines, the gas distribution pipe 76 is divided into a plurality of sections, one section is arranged between each two water tanks 77, each section of gas distribution pipe 76 and the inside of the connecting pipe 79 are respectively in bearing connection with a rotating shaft, circular magnetic blocks are fixed on the rotating shaft, and the diameters of the two circular magnetic blocks are respectively the same as the inner diameters of the gas distribution pipe 76 and the connecting pipe 79; it can be known from the above steps that after cold water enters the water inlet, the cold water contacts the water contact plate first to extrude the water contact plate, the water outlet plate extrudes the first air bag to extrude hydrogen in the first air bag into the collecting pipe to enter the branch air pipe sleeved on the right side of the collecting pipe, the hydrogen enters the second air bag in the water tank closest to the water inlet through the short pipe, before the second air bag is not inflated, the hydrogen in the water tank closest to the water inlet cannot enter the next water tank through the tapered port, namely, only one standby plate can be extended to increase the retention time of hot steam to a very short time, when the second air bag is inflated, the water floats upwards in the water tank, the tapered port is opened, the water in the water tank enters the connecting pipe to impact the circular magnetic block in the connecting pipe, as shown in fig. 4, after the circular magnetic block in the connecting pipe is impacted to rotate around the rotating shaft, the circular magnetic block in the branch air pipe also rotates around the rotating shaft through the characteristic of the magnetic substance, the circular magnetic block in the gas distribution pipe originally just blocks the gas distribution pipe, so that hydrogen cannot enter the lower air bag II, after the circular magnetic block in the gas distribution pipe is pushed to rotate, the hydrogen can flow into the next air bag II, the hydrogen can repeatedly extend out of the standby plate, the cold water flow rate in the water inlet at present is realized, if the flow rate is high, a large amount of hydrogen is extruded, most of the air bags can expand, most of the standby plates extend out, if the flow rate is low, a small amount of the standby plates extend out, more standby plates extend out aiming at high flow rate, the residence time of hot steam is prolonged, the heat exchange requirement is met, the heat exchange efficiency is ensured, the flow rate is low, fewer standby plates extend out, and the use of the standby plates is saved while the heat exchange requirement is met.

An arc-shaped pipeline 11 is arranged at the left end of the heat exchange shell 1, one end of the arc-shaped pipeline 11 is sleeved with the water outlet 8, the other end of the arc-shaped pipeline 11 is sleeved with the left end of the heat exchange shell 1 below the partition plate 6, a blocking net I13 is welded on the inner side of the water outlet 8, a plurality of filter holes are formed in the arc-shaped pipeline 11 below the left side of a check valve I, a trapezoidal water return port 12 is welded below the plurality of filter holes on the left end of the heat exchange shell 1, a descaling ball is slidably connected in the heat exchange tube I2, and the trapezoidal water return port 12 and the joint of the arc-shaped pipeline 11 and the water outlet 8 are respectively provided with the check valve I; from the above steps, in the process that water in the water inlet enters the first heat exchange tube and the second heat exchange tube to exchange heat, the descaling balls in the heat exchange tubes move together with water flow, enter from one end of the heat exchange tubes close to the water inlet, and are discharged from one end of the heat exchange tubes close to the water outlet, as can be seen from figure 5, the pump at one end of the water outlet is started to continuously pump out hot water after heat exchange, the descaling balls are driven by suction force to move upwards, the first obliquely-installed barrier net is welded in the water outlet, the descaling balls move upwards along the first obliquely-installed barrier net to push the first check valve open and enter the arc-shaped pipeline, when the first check valve is opened, if a small amount of hot water flows out together, the descaling balls enter the trapezoidal water return port through a plurality of filter holes formed in the arc-shaped pipeline, the first check valve at the lower end of the trapezoidal water return port is pushed to flow back into the heat exchange shell, and the descaling balls enter the heat exchange shell again through the arc-shaped pipeline and are positioned below the partition plate, so relapse, this step has realized constantly utilizing the scale removal ball to transmit in the heat transfer pipe at the in-process that daily utilization heat transfer shell carried out the heat transfer, and the production of resistance incrustation scale need not the later stage and waits to the incrustation scale to pile up, just shuts down the scale removal after leading to the water yield to reduce.

The port of the arc-shaped pipeline 11 and the left end of the heat exchange shell 1, which are sleeved below the partition plate 6, penetrates through the heat exchange shell 1, the inside of the heat exchange shell 1, which is positioned below the partition plate 6, is provided with a reticular plate 15, the reticular plate 15 is provided with a plurality of meshes, the reticular plate 15 is divided into an upper part, a middle part and a lower part, the right ends of the upper reticular plate 15 and the lower reticular plate 15 are welded on the fixing plate 4 and positioned at the upper side and the lower side of one end of the heat exchange tube I2 and the heat exchange tube II 3, the middle reticular plate 15 is welded on the fixing plate 4 and positioned between the heat exchange tube I2 and the heat exchange tube II 3, and the left ends of the three reticular plates 15 are connected with one end of the arc-shaped pipeline 11; according to the steps, when the descaling balls penetrate through the arc-shaped pipeline and enter the heat exchange shell and are located below the partition plate, due to the existence of the meshed plates, the descaling balls can randomly enter the heat exchange tube I or the heat exchange tube II, the steps are optimized, two channels formed by the meshed plates formed by the three parts guide the descaling balls, the cold water entering from the water inlet is prevented from impacting greatly, and the descaling balls cannot be guaranteed to stably enter the heat exchange tube.

A separation plate 14 is arranged at the joint of the left end of the three-part reticular plate 15 and the arc-shaped pipeline 11, an irregular sliding groove is formed in the separation plate 14, a central bearing of the irregular sliding groove is connected with a triangular block 141, two slide ways are arranged on two sides of the bottom end of the separation plate 14, a check valve II is arranged in each of the two slide ways, and the two slide ways are respectively connected with gaps between the three-part reticular plate 15; as shown in figure 6, the descaling balls slide in the arc-shaped pipeline and enter the separating plate through the irregular sliding groove at the top end of the separating plate before entering the part, which is positioned below the partition plate, in the heat exchange shell, figure 6 shows the initial position of the triangular block in the separating plate, at the moment, the descaling balls enter from the top end of the separating plate and roll along the right bevel edge of the triangular block and enter the pipeline at the right side and enter the gap between the upper mesh plate and the middle mesh plate in figure 6, and are finally guided into the heat exchange tube II for descaling, when the descaling balls roll along the right bevel plate of the triangular block, impact is generated on the bottom end of the right bevel edge when the descaling balls are contacted with the bottom end of the right bevel edge of the triangular block in the process of rolling the right bevel edge of the triangular block, so that the triangular block rotates in the separating plate, the right pipeline is blocked by the rotated triangular block, the left pipeline is conducted, when the descaling balls enter from the top end of the separating plate again, the descaling balls only need to be guided out from the left pipeline and enter the gap between the middle mesh plate and the lower mesh plate, and finally, the heat exchange tubes are descaled in the first heat exchange tube, the step optimizes the steps, so that two heat exchange tubes are descaled one by one, the descaling is ensured to be uniform, and the situations that more water scale exists in one heat exchange tube and less water scale exists in the other heat exchange tube are avoided.

A guide plate 111 is welded inside the arc-shaped pipeline 11, a guide pipe 112 is welded on the left side of the arc-shaped pipeline 11, a spare box 113 is fixed on one side of the arc-shaped pipeline 11 close to the guide pipe 112, a central bearing of the spare box 113 is connected with a turntable 114, three grooves are uniformly formed in the turntable 114, spare balls 115 are connected in two grooves in a sliding mode, a first notch and a second notch are formed in the top end and the right end of the spare box 113 respectively, the first notch, the second notch and the grooves are identical in size, and the diameter of each descaling ball is larger than that of each groove; it can be known from the above steps that when the descaling balls roll in the arc-shaped pipeline, the descaling balls are blocked by the guide plate and enter the guide pipe, as shown in fig. 7, the solid arrow is a descaling ball moving route, the dotted line is a spare ball moving route, when the canal ball enters the guide pipe, the canal ball contacts with the groove at the top end of the inner disk of the spare box first, if the descaling balls are not abraded, the moving route of the descaling balls is shown by the solid line in fig. 6, the descaling balls move, and then return to the arc-shaped pipeline from the guide pipe and enter the heat exchange shell, if the descaling balls convey descaling scale in the heat exchange pipe, the descaling balls rub against the scale or the inner wall of the heat exchange pipe to cause abrasion, when the abrasion degree of the descaling balls is larger and the diameter of the descaling balls is smaller than the groove, the abraded descaling balls are blocked by the guide plate and fall into the groove, and because the guide plate is installed obliquely, the descaling balls fall into the groove and then have impact force toward the left, drive the carousel and rotate in the reserve tank, roll out from two breach during the reserve ball rotation of right side is to two breach departments on reserve tank right side, get into the arc pipeline, get into the below that is located the baffle in the heat transfer shell through the arc pipeline, continue to descale, this step has realized when descale the ball and appear great wearing and tearing under long-time the use, retrieve the descale ball that receives wearing and tearing by oneself, and supply new reserve ball again and descale, need not the shutdown and change.

The descaling ball is made of rubber; the rubber has certain wear resistance and can prolong the service life of the descaling ball.

The heat exchange shell 1 is divided into a left part and a right part, the left part and the right part are in threaded engagement with the heat exchange shell 1, the heat exchange tube I2 and the heat exchange tube II 3 are divided into three parts, and the three parts are in threaded engagement with the heat exchange tube I2 and the heat exchange tube II 3; as shown in the right end of the heat exchange shell in figure 1, the right end of the heat exchange shell can be rotatably disassembled, if the heat exchange tube needs to be replaced after long-time use, the straight line parts of the first heat exchange tube and the second heat exchange tube can be rotated, and the straight line parts and the arc-shaped parts are separated to be disassembled to replace the heat exchange tube.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined heat exchanger of a marine diesel engine comprises a heat exchange shell (1), and is characterized in that: the bottom welding of heat transfer shell (1) has two supporting seats, water inlet (7) and delivery port (8) have been welded respectively to the downside on the left end of heat transfer shell (1), the one end of water inlet (7) and delivery port (8) all has the pump machine through the tube coupling, intake pipe and outlet duct have been welded respectively on the right side that the left section of heat transfer shell (1) is located water inlet (7) and delivery port (8).

2. A combined heat exchanger for a marine diesel engine according to claim 1, characterised in that: the welding of the inside left end of heat transfer shell (1) has baffle (6), the inside welding of heat transfer shell (1) has fixed plate (4), the inside of heat transfer shell (1) is provided with heat exchange tube one (2) and heat exchange tube two (3), heat exchange tube one (2) and heat exchange tube two (3) are the U type, the both ends of heat exchange tube one (2) and heat exchange tube two (3) all with fixed plate (4) sliding connection, all the welding has a plurality of gas boards (5), per two on the inner wall of heat transfer shell (1) and the upper and lower both ends face of baffle (6) all be provided with two standby plates between gas board (5), heat exchange tube one (2) and heat exchange tube two (3) run through gas board (5) and gas board (5) sliding connection.

3. A combined heat exchanger for a marine diesel engine according to claim 2, characterized in that: the heat exchange shell comprises a water inlet (7), a suction machine is connected to the right end of the water inlet (7) through a pipeline, a plurality of water tanks (77) are fixed inside the heat exchange shell (1), one end of the suction machine is connected to the top end, closest to the water inlet (7), of each water tank (77) through a pipeline, a connecting pipe (79) is sleeved between every two water tanks (77), the right end of each water tank (77) is connected with a standby plate through a pipeline, and the standby plate is in a multi-section sleeved mode.

4. A combined heat exchanger for a marine diesel engine according to claim 3, characterised in that: the water inlet structure is characterized in that two connecting plates (71) are welded on the inner side of the water inlet (7), one side, opposite to the two connecting plates (71), of each connecting plate (71) is connected with a water contact plate (72) in a bearing mode, a first air bag (73) is fixed on one side, close to the water contact plate (72), of each connecting plate (71), hydrogen is arranged inside the first air bag (73), a manifold (74) is sleeved at one end of each first air bag (73), an air distribution pipe (76) is sleeved at the right end of the manifold (74), a plurality of short pipes are sleeved at the right end of the air distribution pipe (76), conical openings are welded at the bottom ends of the inner portions of the water tanks (77), two air bags (78) are arranged on the inner sides of the conical openings, the short pipes are connected with the air bag two (78) in a pipeline mode, the air distribution pipe (76) is divided into a plurality of sections, one section is arranged between the water tanks (77), and each section is connected with a rotating shaft with the inner portion of each air distribution pipe (76) in a bearing mode, the rotating shaft is fixedly provided with circular magnetic blocks, and the diameters of the two circular magnetic blocks are respectively the same as the inner diameters of the gas distribution pipe (76) and the connecting pipe (79).

5. The combined heat exchanger of a marine diesel engine according to claim 4, characterized in that: the left end of heat transfer shell (1) is provided with arc pipeline (11), the one end and delivery port (8) of arc pipeline (11) cup joint, arc pipeline (11) are provided with check valve one with delivery port (8) junction, the other end of arc pipeline (11) cup joints with the below that the left end of heat transfer shell (1) is located baffle (6), the inboard welding of delivery port (8) has block net one (13), a plurality of filtration pores have been seted up to the left side below of check valve one on lieing in arc pipeline (11), the below welding that is located a plurality of filtration pores on the left end of heat transfer shell (1) has trapezoidal return water mouth (12), sliding connection has the scale removal ball in heat exchange tube one (2), trapezoidal return water mouth (12) and arc pipeline (11) all are provided with check valve one with delivery port (8) junction.

6. A combined heat exchanger for a marine diesel engine according to claim 5, characterised in that: the heat exchange shell (1) is run through with the port that arc pipeline (11) and heat exchange shell (1) left end are located the below of baffle (6) and cup joint, the inside below that is located baffle (6) of heat exchange shell (1) is provided with reticular lamina (15), a plurality of meshes have been seted up on reticular lamina (15), reticular lamina (15) divide into three parts, upper and lower two the right-hand member welding of reticular lamina (15) is located the last downside of heat exchange tube (2) and heat exchange tube two (3) one end on fixed plate (4), mid portion reticular lamina (15) welding is located between heat exchange tube (2) and heat exchange tube two (3) on fixed plate (4), the triplex the left end of reticular lamina (15) all is connected with the one end of arc pipeline (11).

7. A combined heat exchanger for a marine diesel engine according to claim 6, characterised in that: the left end of reticular lamina (15) is provided with separator plate (14) with arc pipeline (11) junction, irregular spout has been seted up to the inside of separator plate (14), the central bearing of irregular spout is connected with three hornblocks (141), two slides, two have been seted up to the bottom both sides of separator plate (14) all be provided with check valve two in the slide, two the slide respectively with the clearance connection between the triplex reticular lamina (15).

8. A combined heat exchanger for a marine diesel engine according to claim 7, characterised in that: the inside welding of arc pipeline (11) has guide board (111), the left side welding of arc pipeline (11) has guide pipe (112), one side that arc pipeline (11) are close to guide pipe (112) is fixed with reserve tank (113), the central bearing of reserve tank (113) is connected with carousel (114), three recess has evenly been seted up on carousel (114), two of them sliding connection has reserve ball (115) in the recess, breach one, breach two have been seted up respectively to the top and the right-hand member of reserve tank (113), the size of breach one, breach two, recess is the same, the diameter of scale removal ball is greater than the recess.

9. A combined heat exchanger for a marine diesel engine according to claim 8, characterised in that: the material of the descaling ball is rubber.

10. The modular heat exchanger of a marine diesel engine as set forth in claim 9, wherein: two parts about heat transfer shell (1) divide into, control two parts heat transfer shell (1) thread engagement, divide equally for triplex, triplex heat exchange tube one (2) and heat exchange tube two (3) through thread engagement between heat exchange tube one (2) and the heat exchange tube two (3).